Paris green or Schweinfurt's green is a cheniical compound of arsenic, copper and acetic acidIts chemical name is copper aceto-arsenite, its f?r" mula being 3 Cu H As 03 -jCu (C2 H3 Os)r It is therefore a double salt of copper arsenite and acetate. It is a microcrystalline powder 01 emerald green colour. It is practically insoluble in water. It is perfectly soluble in ammonia a11 concentrated a...

The roasting of chalcopyrite, the most exploited copper mineral, presents a very important step in the copper extraction during the traditional smelting-refining process, as well as in advanced processes in copper metalurgy 1-2 . Consequently, numerous researches have been investigated, in order to study the chalcopyrite oxidative roasting parameters, its mechanism and reactions involved 1-16 ....

In copper heap leaching structures, the ore is leached by an acidic solution. After dissolving the ore mineral, the heap is drained off in the acidic solution using a drainage system (consisting of a network of perforated polyethylene pipes and gravelly drainage layers) and is, then, transferred to the leaching plant for copper extraction where the copper is extracted and the remaining solution...

Improved processes for the preparation of biphenyl-based phosphine ligands t-BuBrettPhos, RockPhos, and BrettPhos are presented. The new methods, featuring the use of Grignard reagents and catalytic amounts of copper, are superior to the previous methods, which require the use of t-butyllithium and stoichiometric amounts of copper. Specifically, the use of less dangerous reagents provides a saf...

A thin film process using ECR-ion beam sputtering with ultra pure (99.999999%) copper target was investigated for improving transportation properties in the film. The electric resistivity of the thin film was 40% lower than that of using a commercial-grade purity target. And the optical qualities evaluated by the transmission and reflection spectrum measurements were also indicate slower relaxa...

A novel dot-like Cu2O-loaded TiO2/reduced graphene oxide (rGO) nanoheterojunction was synthesized via UV light reduction for the first time. Cu2O with size of ca. 5 nm was deposited on rGO sheet and TiO2 nanosheets. The products were characterized by infrared spectroscopy, Raman spectrum, UV-Vis diffuse reflectance spectra, XPS techniques, photoluminescence spectra. The results demonstrated tha...

In this paper, cyclic flaring and sinking (CFS) as a new severe plastic deformation (SPD) method was employed to produce the ultrafine grain (UFG) copper tubes. The extra friction has eliminated in the CFS method that provided the possibility for production of longer UFG tubes compared to the other SPD methods. This process was done periodically to apply more strain and consequently finer grain...